Die for covering tubes.



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l A 1 u t o (lo Ilodel.) -2 shun-sum r W W g I :3 I \U N0. 7l5,570. IPatented D06. 9. 902. P. FRIEL.

DIE FOR COVERING TUBES.

(Application filed June 6, 1902.) I y (lo Nodal.) 2 Sheets-Shut 2.

I m VENTOR A TTOHNE Y8.

I UNITED STATES PATENT UFFICE.

PATRICK HENRY FRIEL, OF KFNOSHA, WISCONSIN.

DIE FOR COVERING TUBES.

SPECIFICATION'forming part of Letters Patent No. 715,570, dated December1902- Application filed June 6, 1902.

. To all whom, it may concern; I

Be it known that I, PATRICK HENRY FRIEL, of Kenosha, in Ihe'county ofKenosha and State of Wisconsin, have invented a new and usefulImprovement in Dies for Covering Tubes, of which the following is aspecification.

The object of my invention is to provide a simple, cheap, practical, andeflicient die for covering. a metal-tube with acasing or outer jacket ofbrass or other metal. It is an improvement upon my former patent, No.696,865, dated April 1, 1902; and it consists in a die of suchconstruction as forms a double lock-joint with flush parallel edges,which makes a stronger and a more nearly invisible joint than the singlelock-joint heretofore made on my die as already patented. My newconstruction follows and includes the old con-' struction, but addscertain other configurations to the parts of the die ,to produce the newresult, and it will therefore be necessary to first describeaccuratelythe old die as mation and Fig. 1 showing it completed.

Fig. 2 is a cross-section on line 00 a: of Fig.1. Figs. 3, 4, and 5 aredetached views of portions of the die.

taken through the block A, and Fig. 5 is a similar view taken throughblock A Fig. 6 is a top view, and Fig. 7 a bottom side view, of thefolder; and Fig. 8 is a longitudinal section through the die.

Referring now to Fig. 1. and Fig. 1, it will be seen that the old singlelock-joint simply hooks one edge of the brass casing into the otheredge,as in Fig. 1, and then flattens them down, as in Fig. 1.

In my new double lock (see Figs. 1 and l this same interlocking of thehooked edges is employed on one side, as seen at 4; but the other sideof the brass sheet is formed into a Fig. P is a sectional view SerialN6. 110,471. (No model.)

depression or groove 2 and a ridge 3, and when the part his -masheddown, as in Fig. l the part 3 is flattened down and overlapped upon thepart 2, forming two bends and three thicknesses of metaton-this side,which bring the two sides of the joint practically flush, making apractically invisible and stronger joint.: I will now describe the dieby which this result is obtained.

In the drawings, A A A represent the three parts of the die, which arein the nature of steel blocks held together, as shown in Fig. 1.-Theblock A is of less height than A and A and is also somewhat thicker.Along the upper surface of block A is formed a transverse openingO,which opens along its length through the upper surface of the block andhas atapering throat atthe1eft- .hand side in Fig. 3, which is the pointwhere the tube and sheet-metal ribbon first enter .the die. On one sideof this opening the on the other side. is held a detachable folder-plateB by means of a set-screw a and set-screw a which latter passes throughthe folder-plate and'entering a hole in the subjacent die-block preventsthe folder-plate from turning about the'setscrew a and holds said platein true position. In the die-block A the hole 0' has alongone side aV-shaped notch or groove g through the same, as seen in Fig. 4:, whichgroove opens laterally into the central hole, while the opening 0 inblock A is circular, as shown in Fig. 5.

The openings 0 O 0 when the blocks are brought together, as in Fig. 1,are in coincidence with each other and give passage to the tube T andthe metal strip 0, which is to form an external jacket around the tube.This jacket is formed from a ribbon of sheet metal, which is fed from aspool or reel, as in Fig. 8, and which is formed around and firmlyjoined about the tube by pulling the tube T and the sheet-metal ribbonthrough the die, as indicated by the arrows in Figs. 1 and 8.

The former B has a shank portion 1), with a short right-angularextension I) on one side and a longer right-angular extension I) on theother side. When this former is in position,

as shown in Figs. 1, 2, and 8, the short extension 1) is on the outer orentering side of the die and the longer extension 12 is on the innerside and extends into the V-shaped groove g of block A and through thesame. The extensions 1) b are convex on the outside and concave on theinside, the concave surface corresponding in cross-section to thecross-sectional curve of the tube. The extensions b b constantly taperto a diminishing cross-section from b to b The function of this folderis to gradually fold or curl the outer edge 0 of the ribbon over theother edge. The first curling action is efiected in the block A aroundthe large end of former B, as seen in Fig. 2. Then as the tube and itscovering pass into the block A over the smaller extension b of theformer the curled edge is folded around the other edge, as seen in Fig.4c, and thence it passes into the dieblock A as seen in Fig. 5*, wherethe folded parts are mashed down fiat to produce a locked joint in whichthe edges are so compressed as to be scarcely noticeable.

To form an inner bearing for the tube T as it is drawn through block A asteel plug P (shown in dotted lines in Fig. 8) is held stationary insidethe tube by means of a rod B.

As so far described the construction and operation of the die isprecisely the same as shown in my previous patent, and I will now pointout the novel construction of my die by which the double joint shown inFigs. 1 and 1 is formed. In the inner periphery of the die-block A andunderneath the formerplate I form a V-shaped groove 9, which formsbetween it and the edge of the slot a dovetail rib 7', extendingparallel with the alined holes of the die-blocks, and a correspondingalined rib 'r is formed in the die-block A by V-shaped grooves g and 9.These dovetail ribs 7' and 7" form the depression 2 of Fig. 1" in thebrass ribbon, and when the tube and its casing are pulled through theround hole of the die-block A the shoulders 3 and 4 are flattened downto form flush abutting edges and a double lock-joint, as seen in Fig. 1

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. Adie-blockforcoveringroundmetalsurfaces with an external jackethaving a throat formed on its inner periphery with two parallel groovesmaking a dovetail rib, combined with a former lying in one of saidgrooves substantially as and for the purpose described.

2. A die for covering round metal surfaces with an external jacket,consisting of a block having a hole through the same opening on theupper surface of said block and a dovetail rib along said opening, ahigher block having an opening through it with two V- shaped notches inits side forming a dovetail rib lying in line with the dovetail rib ofthe first block, and a folder attached to the upper surface of the lowerblock and having two extensions, one extending outwardly and the otherone extending inwardlyiuto one of the V-shaped notches of the higherblock substantially as and for the purpose described.

3. The die for covering round metal surfaces with an external jacket,consisting of a block having a hole through the same opening on theupper surface of said block and a dovetail rib lying inside said holeand parallel with the opening on the upper surface, another block havingan opening through it with twoV-shaped grooves g, g forming a dovetailrib in alinernent with the dovetail rib of the other block, a folderattached to the upper surface of the first block and having twoextensions, one extending outwardly and the other inwardly into one ofthe V- shaped notches of the inner block, and a third dieblock having aplain round hole disposed behind the other blocks and adapted to flattendown the double locked edges of the metal ribbon substantially asdescribed.

PATRICK HENRY FRIEL.

Witnesses:

GROFTON L. CAMERON, G. N. GONNERMANN.

